參數(shù)資料
型號(hào)： LMV932MMX
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 運(yùn)算放大器
英文描述： 1.8V, RRIO Operational Amplifiers
中文描述： DUAL OP-AMP, 5500 uV OFFSET-MAX, 1.4 MHz BAND WIDTH, PDSO8
封裝： MSOP-8
文件頁(yè)數(shù)： 14/19頁(yè)
文件大?。?/td> 625K
代理商： LMV932MMX
Typical Applications
(Continued)
4.0 HALF-WAVE RECTIFIER WITH RAIL-TO-GROUND
OUTPUT SWING
Since the LMV931/LMV932/LMV934 input common mode
range includes both positive and negative supply rails and
the output can also swing to either supply, achieving half-
wave rectifier functions in either direction is an easy task. All
that is needed are two external resistors; there is no need for
diodes or matched resistors. The half wave rectifier can have
either positive or negative going outputs, depending on the
way the circuit is arranged.
In
Figure 3
the circuit is referenced to ground, while in
Figure
4
the circuit is biased to the positive supply. These configu-
rations implement the half wave rectifier since the LMV931/
LMV932/LMV934 can not respond to one-half of the incom-
ing waveform. It can not respond to one-half of the incoming
because the amplifier can not swing the output beyond either
rail therefore the output disengages during this half cycle.
During the other half cycle, however, the amplifier achieves a
half wave that can have a peak equal to the total supply
voltage. R
I
should be large enough not to load the
LMV931/LMV932/LMV934.
5.0 INSTRUMENTATION AMPLIFIER WITH
RAIL-TO-RAIL INPUT AND OUTPUT
Some manufactures make a non-“rail-to-rail”-op amp rail-to-
rail by using a resistive divider on the inputs. The resistors
divide the input voltage to get a rail-to-rail input range. The
problem with this method is that it also divides the signal, so
in order to get the obtained gain, the amplifier must have a
higher closed loop gain. This raises the noise and drift by the
internal gain factor and lowers the input impedance. Any
mismatch in these precision resistors reduces the CMRR as
well. The LMV981/LMV982 is rail-to-rail and therefore
doesn’t have these disadvantages.
Using three of the LMV981/LMV982 amplifiers, an instru-
mentation amplifier with rail-to-rail inputs and outputs can be
made as shown in
Figure 5
.
In this example, amplifiers on the left side act as buffers to
the differential stage. These buffers assure that the input
impedance is very high and require no precision matched
resistors in the input stage. They also assure that the differ-
ence amp is driven from a voltage source. This is necessary
to maintain the CMRR set by the matching R
-R
with R
-R
4
.
The gain is set by the ratio of R
/R
and R
should equal R
1
and R
equal R
. With both rail-to-rail input and output
ranges, the input and output are only limited by the supply
voltages. Remember that even with rail-to-rail outputs, the
output can not swing past the supplies so the combined
common mode voltages plus the signal should not be
greater that the supplies or limiting will occur. For additional
applications, see National Semiconductor application notes
AN–29, AN–31, AN–71, and AN–127.
200326C3
200326C2
200326C4
FIGURE 3. Half-Wave Rectifier with Rail-To-Ground Output Swing Referenced to Ground
200326C0
200326B9
200326C1
FIGURE 4. Half-Wave Rectifier with Negative-Going Output Referenced to V
CC
200326G4
FIGURE 5. Rail-to-rail Instrumentation Amplifier
L
www.national.com
14
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參數(shù)描述
LMV932MMX/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMV932-Q1 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:1.8-V OPERATIONAL AMPLIFIERS WITH RAIL-TO-RAIL INPUT AND OUTPUT
LMV932Q1MA/NOPB 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LMV931-N/LMV931-N-Q1/LMV932-N/LMV932-N-Q1/LMV934-N/LMV934-N-Q1 Single/Dual/Quad 1.8V, RRIO Operational Amplifiers
LMV932Q1MAX/NOPB 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LMV931-N/LMV931-N-Q1/LMV932-N/LMV932-N-Q1/LMV934-N/LMV934-N-Q1 Single/Dual/Quad 1.8V, RRIO Operational Amplifiers
LMV932QDRQ1 功能描述:運(yùn)算放大器 - 運(yùn)放 AC Dual 1.8-V Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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